Current fluid-meter.



E. LAMBERT.

CURRENT FLUID METER.

APPLICATION FILED RIAII. I. I9I2. Ilt mmm 5311.151918.

4 SHEETS-SHEET I.

4F. LAMBERT.

CURRENT FLUID METER.

APPLICATION man mm1. |912.

L%% Patented Jan. 15, 1918..

4 SHEETS-SHEET 2.

WMM/mm wu@ wcm F. LAMBERT.

CURRENT FLUID METER.

LQU

APPLICATION FILED MAR.1.1912.

Patented Jan. 15, 1918.

4 SHEETS-SHEET 3.

F. LAMBERT.

CURRENT FLUID FIIE'EH, APPLICATION FILED IIAII I. :912.

Paisenfd Jan. 15, N18.

f;- SHEETS-SHEET 4.

i im@ @one remmer N ori-rien 'FRANK LAMBERT, OF BROOKLY, NEW YORK,ASSGNGR T0 THOMSON METER COM- PANY,.OF BROOKLYN, NEW YORK, A CORPORATIONF NEWT JERSEY.

To dll'whom it may concern.'

Be it known that l, FRANK LAMBERT, a

citizen of the United States, and a" resident of Brooklyn, Vin thecounty of ,Kings and State `of New York, have inventedcertain newanduseful improvements in Current Fluid-h/feters, of which thefollowing( is a specirication.`

My inventioirrelates, generally, to current fluid meters, moreespecially, water meters. One of 'the main objections to current metersas heretofore constructed is their lack of accuracy especially at smallflows.` Another `hot fluids.

.One feature of` my invention resides in a inefterrotor of novelconstruction, composed ofjsuch material, and so constructed, as not beaffected injuriously by such temperatures asfare experienced in theineteringof nary hot fluids, but which nevertheless ranged to be {ioatedor held in suspension by the fluid while the latter is flowing throughthe meter. Another `feature of my invention resides in a substituteforthe'" ordinary stuffing box through which `passes the shaft drivingthe registering` mechanism,

whereby the wear'on the parts of the internal reducing gear mechanismand resistance opposing free motion of the rotor occasioned byV frictiondue to passage of vsuoli shaft through a stutiing box` is reduced to amini- ;nium. Another feature' of my invention resides inV meanstoincrease the sensitiveness of the meter at low flows, by providing,outside of the main rotor, a speeder or second# ary rotor 'to drive theregistering mechanism at Hows otherwise too small to actuate the mainrotor or to give it the necessary speed J for true registration. Otherfeatures ofniy invention are: Means to prevent running of` the meterafter the flow has been shut ed;

and means whereby the rotor is relieved of unnecessary friction andstrain, particularly. friction and sti-ain due to end thrust, so2 det-,

Specification of Letters Patent.

- i CURRENT? FLUID-METER'.

Patented dan. t5, mile;

.Application nea March 1, 1912. serial No. cease?.

rimental when accurate registration at small flows is desired.` y

l will now proceed to describe my invention with reference to the,accompanying drawings, iii., which one forinof meter embodying myinvention is illustrated, Vand will then point out the novel featuresinclaims.l ln saidmdii'aivings:

Figurel shows a central vertical section of the meter, the registeringmechanism (except the first driving member thereof) beingomittedg,Fig-.2 shows a top view `of the speed-reducing gear train;

Fig. 3 shows a transverse 'horizontalsec` y tion of the meter taken gustabove the top of the rotor Figli shows a detail vertical section of an`alternative stuliing-boi construction;

shows a detail vertical section of an alternative construction lof theupperl portion of theiotor shaft, comprising a movable worm-screwcarried by 'said shaft;A

6 shows a horizontal section of the meter casing, through the rotorchamber thereof, looking` downward;

Fig. 7 sho' 's a centralvertical section of an'alternativc forni ofrotor, and Fig.` 8

shows a horizontal section of suoli rotor.

.Figs 9 and l() :illustrate alternative con-. sti-notions of the rotorvaries, Fig. 9 illus" trat-ing the formation of such vanes of stripswhichare slit laterally at intervals, to permit ready accommodation ofsuch strips to helicoidal curvature, Eig. 10 illustrating the formationof such vanos from segmental pieces. y

Fig'. 11 shows a c ii'tral vertical section of alinetertlie consti-u ionof which is in some respects different from the construe-tionsheretofore illustrated and described.

In, thekirawinp's, l designates the main orpressure casing of theflow-chamber of the n'ieter, said casing beingprovided with aninlet i?.and with an `outlet S 4 designates arot'or chamber located withincasingl, and

fc'l'esijgi'iates the rotor. The casing l is faced and bored in line toreceive both .the rotorv chamber and the bridge `Gl carryingzthe.itfdoin'ef secured tothe upper end f Ito meter. The casing 1 isprovided with the the inlet from the outlet, and in this partition thereis a large central aperture in whichis freely fitted the lower portionof the rotor chamber Ll, which chamber is secured to said partition 8 bymeans of three screws 9 passing freely through luos 10 ofl the rotorchamber and threaded into the partition 8. The lower portion of therotorchamber is of spider construction, the openings 11 of which permitfree flow'of fluid from entrance passage 2 into the rotor. The spindle12 is centralized and supported by said spider, and is held in place bymeans of a nut 13.

The rotor comprises a central hub 14e, bored through the greater portion'of its length to permit said hub to fit freely upon stationary spindle12; an outer shell 15, and lhelicoidal vanes 16 secured to the hollowhub 141 and to the' shell 15 by fitting them within helicoidal groovesprovided in the outer surn face of the hollowT hub 14, and in the innersurface of the shell 15. Particular preferred constructions of the rotorand vane's 16 will be` described hereinafter. rlliese vanes divide theflow space between hub let and shell 15 into a plurality of helicoidalpassages. Fluid flowing through these passages of course tends to rotatethe rotor. At its base, the hollow hub 14 'of the rotor is provided witha hollow bell-shaped foot 17, below which is a circular valve disk 17,freely mounted. on spindle 12, which, when the vrotor is in itslowermost position, covers and closes the admission ports 11 between thearms of the spider of the rotor chamber 4. Water or other fluids passingthrough the meter will necessarily force this disk 17 t up` ward, moreor less, according` to the rate of flow, so liftingpthe entire rotor;and the fluid, flowing around the edges of the disk 17L1 will enter thevarious passages of the rotor ,andwill impart rotation to said rotor;the

lift of the rotor thus produced bein@ sub-y stantially proportional tothe rate of flow, until the maximum lift is attained. At such maximumlift the passages through the meter will be maximum, and willsubstantially equal in area the area of cross section of the pipe forwhich the meter has been designed. Vhen the flow through the meter isout off, the rotor drops, under the influence of gravity, and thefriction between the bevcled periphery of disk 17 a and its seat, andbetween the upper face of said disk and the face of the foot 17, bringthe rotor-quickly to rest and thus prevent racing or idle rotation ofthe rotor and registering mechanism after the flow ceases.

A` shoulder 39 on spindle 14 limits the upward movement of the disk 17a.The rotor 5 however, may lift slightly even after the disk 17L has beenstopped by the shoulder 39 39 may be dispensed with, and the hollowvfoot 17 of the rotor formed to close ports 11 when said foot" is in' thedown position; In this case, to withstand the end thrust. the upper endof hollow shaft 141 is provided with a bearing socket 59, which, whenthe rotor is fully lifted, will come into contact witha bearing pointG0, carried by a fixed portion of the meterstructure,vbut free to rotateand to lift, and` itself carrying a separately formed hardened bearingpin 61 adapted to engage another lhardened pin 6:2 carried by a screw63; the space between 60 and 63 being filled with lubricant 64.

ln either of the constructions Vthus described, the rotor is in fullfluid suspension during the operation of the meter. 1

In order, however, to insure that the rotor shall start in rotation assoon asV flow begins through the meter, even though ysuch flow be veryslight, l provide the rotor with a secondary rotor or speeder, 18, whichis particularly effective to start'operation of the registeringmechanism when flow rst begins and when vsuch flow is lextremely small,'such secondary rotor or Vspeeder comprising, in the construction shown,a disk 18 provided with oblique ports or nozzles 19 so directed that'the fluid issuing through them tends to cause said disk 18 to rotate inthe direction in which the rotor 5 normally rotates. This disk 18 in itslowermost position, as shown in F ig. 1, (which is the position occupiedby the disk when the ow through the meter is small), stops the flow offluid through the rotor except for the fluid which may flow through the`oblique ports 19 mentioned.

lVlien suchflow through the rotor 5 lexceeds a certainaniount, dependingupon the size and number ofJ these ports 19, the entire disk 18 startstolift, said disk being mounted to slide upon the hub of the rotor, andbeing provided with a key 20 working in a key slot 21- of the hub of therotor, whereby rotation of the disk 18 with respect to the rotor isprevented. The disk 18 serves, when seated on the rotor, to prevent flowfrom the passages of the rotor except those passages lwith, which theports 19 communicate, thereby making the flow through those rotorpassages with which the ports 19 communicate, correspondingly greater atsuch small flows', whereby the rotor is caused so f 1,253,559525 A. cip1 tolhave atf such-small flows, a higher rotative speed than it wouldotherivise have, thereby compensating for slip `of `the rotor at suchlow rates of iiovv.' Theplate 18 therefore constitutes an obstructorobstructing `the flovv of fluid through certain passages of the rotor atlovv rates oflioiv, as

described in my application filed March 15, 1911, Sr. No. 614,614;Furthermore, since the ports 19 are oblique and incline in the samedirection as the flowV passagesV of `the rotor, the fluid passingthroughsaid ports 19 at such greater speed tends to cause roe tation ofthespeeder 18, hence of `the rotor, by the intermediation of keyengaging slot 21. To demonstrate the action. ofthe Speeder 18 with ports19, the following experiment can be made: Remove the driving key 2O soas to leave the speeder free to revolve independently of the rotor'. ltWillfbe found that at 10W iovvs, at flows Which are Vtoo small toactuatethe rotor itself,A the speeder vvillrotate freely, and if the key2() is put back in position, it vvill be found that not Vonly theSpeeder, but also the rotor, will rotate with it at a flow found beforeto be too small to rotate vthe rotor alone; in other Wordsat small flowsthe Speeder drivesthe rotor; at large flows, the rotor becomes thedriver and carries with it 4the Speeder.r A t By varying the size andnumber or angle of ports 19, or the Weight of thespeeder 18,the speed ofthe rotor for low flows can be adjusted so as to have the low 'floivregis* In another application filed March 15,

1911, Serial No. 614,6141 have claimed an obstructorfor obstructing thepassage area of the iiuid through the rotor at low rates of flow andtherefore I do not claim such invention broadly in this case. However,it Will be seen that the structure of 'the obstructorsshown in suchprior application is different, that those obstructors cannot, by actionof the flovv, take alone a movement of rotation, but are only intendedto restrict the fluid passage through the rotor, while inthis presentcase the obstructor, 18 acts not only as an obstructor, but also as aSpeeder or secondary rotor to start or force the rotation. of the mainrotor at flows other- Wise too small to start the rotor alone.

A collar Q2 on the shaft 11 of the rotor limits the upvvard motion ofthe'obstructor 18.

The upperportion of the shaft 11 is pro-` vided4 with avvorm screw 23intermeshing with a Worm Wheel 24E, on a shaft 25 mounted in bearings ina `bracket 26 secured to the bridge 6. rlhis worm 23 is made long, inorder that it may remain continuously in mesh with Worm Wheel 211notwithstamling lifting of shaft l-il. Shaft carries a Worin 27`intermeshing with a worm wheel 2S mounted on a vertical shaft 29 havingbearings inthe bracket 26, and this shaft "39 carries a pinion 30meshing with a gear 39 mounted on a spindle formed on this bracket L6,the gears Q3, 2a, 27, 28, 30 and 31 constituting reducing gearing. Itwill. be noted that thefaXis of gear 31 is in line with the axis` ofspindle 12.

Inthe construction shoivn in Fig. 1 the Wormfl is `formed on shaft 14Citself. ln the alternative construction shown inv Fig. 5 the worm,`heredesignated by numeral 23, isa piece separate from shaft 11,ren1ovablysecured to shaft- 14 by means of a headed extension pin screw-connectedlto the hollovvvvorm 23, the head of this pin 32 lacing heldto shaft 14:by a clamping nut i355, ln this construction the lower end of the nutperforms theffunctioril of the stop shoulder 22 of Fig. 1.

As shown particularly in `Fig. 1, the hollow shaft 14 is provided with asmall hole 311 which constitutes a port permittiiig controlled entranceor exit of fluid to or from the spaceB Within shaft 1li above the top 1of spindlel, thereby avoiding too great retardation of up and downmotion of the rotor due to presence of fluid in this space.

Grooves 3G and 38 may be provided. iu the inner face of rotor chamberand in spindle 12 to provide Water lubrication, and Water packing toprevent leakage between the rotor and rotor chamber, and thereby makesit 'unnecessary to lit said rotor too closely within its sleeve.'il-heee grooves 39S may be either circular or helical.

.llVhile obviously `the roter chamber 11 might be cast in one piece withthe casing 1, l prefer to make said rotor chamber a separate member,especially to prevent deformation ofthejnieter casing affecting therotor chamber. lt not infrequently,happens that the meter casingdeformed by stress placed lupon it due to connecting it to large pipes;and when the rotor chamber is a member separate from` the casing 1, suchslight deformation of the main casing does not cause correspondingdeformation of the rotor chaniber,if freely fitted in the casing. and sodoes not give rise to clamping of the rotor such as might prevent therotor from revolving freely.

' The Vupper or last gear, 31, of the internal gear-train of the meter,is provided with openings del into which lit the arms of a` yoke mountedupon a vertical spindle d6 passing throughv a suitable stuffing `box inlll?) lill) the top of the dome 7, and carrying at its upper end a gear48, which gear isthe drivsensitiveness is desired, as in a meter such asdescribed, it is important to reduce to a minimum the friction of theshaft driving the registering mechanism, in its packing box.compressible packing material are either prone to leak, or, if set uptight lenough to prevent leakage, interpose far too much frictionalresistance to the rotation of' the rotor. These objections arc obviatedin the construction herein described, wherein, instead of' employingcompressible packing material, I employ a labyrinthine construction,comprising one or more tubular spindles located between two or morefixed concentric sleeves. In y the construction shown in Fig. 1, theyoke 45 is provided with a hollow spindle 49 located between conceiitricsleeves, 50 and 51, with which the regis-l ter'cup 52 is provided. Inthe construction shown in Fig. 4 the yoke 45 is provided with twoconcentric spindles 49, and the register' cup 52 is provided with threeconcentric sleeves 50, 51 and 53. Obviously there may be few or many of'these concentric spindles and sleeves, according to the number ofconvolutions desired in the labyrinthine leakage preventing device. Inpractice a clearance of only one or two thousandths of an inch isprovided between adjacent surfaces of the labyi'inthineleakage-preventing device, and in assembling the parts, a mixture oflubricant and plumbago is introduced between the surfaces. I have foundthat no other packing is required to prevent leakage, and that, when theantileakage-device described is used the parts move very freely andthere is no leakage. I customarily provide an oil hole 54, through whichlubricant may be introduced from time to time, and this oil hole may becovered by a screw cap 55, having within it a soft washer 56, therebeing ample clearance between such washer and the screw cap 55, and thespindle 46. vWith this construction, the labyrinthine antileakage devicedescribed, may be lubricated from time to time by removing the cap 55and washer 56, while leakage around the spindle 46. is absolutelyprevented.

To facilitate construction of the rotor, and also to make the reactionof the fluid upon the rotor as nearly peripheral as possible, Isometimes use the rotor construction shown in Figs. 7 and8, in whichconstruction, surrounding the hollow hub 14, there is what may be termeda false hub 14a, closed at the bottom; the vanes 16 being provided iiithe Aspace between this false hub 14n and the shell 15. `The diameter ofthe false hub 14L being much greater than that of the hub 14, thecurvature of the innerv edges of the Ordinary stuffing boxes containing;

Vassume the proper helicoidal` curve.

vanesY is much less abrupt than in ther construction illustrated'inrFig. 1. Whenvthis In Figs. 9 and 10 Iv illustrate the construcl.

tion of the vanes of the rotor 5. rIhese vanes are preferablyconstructed of hard sheet metal, but Vwhen so constructed, if formedfrom plain strips,it is difficult to make tiem his difliculty may beovercome, however, by providing the strip with slit-s 57, ,as indicatedin Fig. 9. In some cases, however, VI `form the vanes ofsegmental-.pieces 58, as shown in Fig. 10. slipped into place and, beingshort, take the proper shape. Vanes constructedin either of these waysmay be touched upwith a little solder, to avoid leakage. The yresultingrotor forms avery `rigid unit whichis light and true. Y

It will be noted that in the meter described, the rotor, the gear train,and the.

spindle 46 driving the register mechanism, all have a common axis. Thisis aA great advantage, as it greatly simplifies the accurateconstruction of the mechanism of the meter, and tends to insure thatsuch mecha-- nism shall run very easy.

W hat I claim is ,Y

l1. A fluid meter comprising in combination a. main casing having inletand outlet connections and a pressurechamber, a structurally separaterotor chamber seated within said pressure chamber and Y spaced vawayfrom the sides thereof and having a base provided with one or more portsforl the flow of fluid from such inletconnection into said rotorchamber, and a rotor mounted for rotation within said rotor chamber andalso for axial movement therein, and arranged to be held in fluidsuspension by the action of the flowing fluid upon it.

2. A fluid meter comprising in combina-V tioii a main casing havinginlet and outlet connections and a pressure chamber, astructurallyseparate rotor chamber comprising,

axial movement therein, and. provided with ineans adapted to close suchport or ports in'A one position of the rotor, and to hold said rotor influid suspension in the flowing fluid, by the action of such fluid uponit.

3. A fluid meter comprising in combination a main casing having inletand outlet connectionsdand a pressure chamber, estruc# Such segmentsareV readilyV iis ist

.fraterna turally separate rotor chamber comprising a sleeve seatedWithin said pressure chamber and having a base provided with one or moreports for the floiv of fluid from such inlet connection into said rotorchamber, such sleeve spaced away from the sides of said pressurechamber, anda rotor mounted for rotation within' said sleeve and alsofor axial movement therein and provided with means adapted to close suchport or ports when the rotor is at rest, V.and to hold said rotor influid suspension in the flowing iuid, by the i action of such fiuid uponit.

lla, A fluid meter comprising incombination a main casing having inletand outlet connections and a pressure chamber, a structurally separaterotor chamber comprising a sleeve seated in said pressure chamber, andprovided with a base having one or more ports for the flow of' fluidthrough it, such sleeve spaced away from the sides of said pressurechamber, a rotor spindle carrovided with a base havin@ one or `moreports for the flow of fluid through it, such sleeve spaced away from thesides of' the said pressure chamber, a rotor spindle 4carried by saidbase, and a rotor Within saidrotor chamber and mounted for rotation onsaidv lspindle and also for axial motion thereon,

said rotor provided with means adaptedto close such port or ports whenthe rotor is at rest, and to hold the rotor in fluid suspension in theflowing fluid, by the action of i such fluid upon it.

6. A fluid meter comprising in combination a main casing having inletand outlet connections and a pressure chamber, a structurally separaterotor chamber'seated in said ressure chamber and Jrovided With a base 9having one or more ports for the flow of Vfluid. through it, a rotorspindlecarried by `said base, and a rotor Within said rotor chamber andmounted for rotation on said spindle and also for axial motion thereon,said rotor provided with a disk below the rotor proper butconnectedtherevvith and adaptedfto close such port or ports in `oneposition of the rotor and to holdtherotor in Huid suspension in theflowing fluid by the action of such fluid upon it.

l?. A fluid meter comprising in combination a rotor chamber, a rotorVlocated within said chamber and :mounted to rotate and also to moveaxially, said rotor arranged to be held in suspension in the fluid, bythe ae said screw being of a length adequate to permit continuedengagement of the Worin screw and. Worm wheel, notwithstanding axialmotion of the rotor. Y 8. A fluid meter comprising in combination arotor chamber, a rotor therein, and a valve provided on adownwardly-extending foot of said rotor and arranged to close said rotorchamber against the admission of fluid, when the flovv of fluid to bemetered stops, and to open such chamber for iiuid admission when theflow of such fluid begins.

9. A fluid meter comprising in combination a rotor chamber, a rotortherein and a gravity-operated valve provided on a downwardly-extendingfoot of said rotor and arranged to close said rotor chamber against theadmission of fluid, When the flow of fluid to lbe metered stops, and toopen such chamber for fluid admission when the flow of such fluidbegins.

10. A fluid meter comprising in combination a casing having a rotorchamber and a rotor therein arranged to be immersed in the fluid to bemetered When` in action, and having a Weight greater than that of thefluid which it displaces, said rotor provided with adownwardly-extending foot itself provided with a disk, in the path ofthe flowing fluid, and arranged to hold said rotor when inaction, influid suspension in the fiovving fluid, said disk arranged to engage afixed member of the meter structure and arrest rotation of the rotorwhen the rotor descends under the influence of gravity upon cessation offlow.

ll.. A fluid meter comprising in combination a casing, a rotor spindletherein, and a rotor mounted to rotate on said spindle, and to moveaxially thereon and comprising a hollow hub .fitting over said spindleand closed at one end, and provided with a port permitting flow offluids to and from the space between the end of said spindle and the endof the bore of the hub.

12. A fluid meter comprising a rotor provided with a plurality ofpassages for 'the flow of the fiuid to be metered and with automaticobstructing means for one or more of said passages comprising anaxially-movable obstructor arranged to be moved in one direction by theaction of the fiuidand in the opposite direction by an opposing force. A

13.,A fluid meter comprising a rotor provided with a plurality ofpassages forthe flow of fluid to be metered, and with automaticobstructing means for one or more of lll) lidi) Y passages, such orificeor orifices directed said passages comprising a member ari ranged tobemoved in one direction by the.

vided with one or more escape-orifices in communication with one ormoi'e of said rearwardly with respect to the iiorinaldirection ofrotation of the rotor, vwhereby reaction of the fluid escaping from suchorifice or orifices tends to start the rotor in rotation.

15. A fluid meter comprising a rotor provided with a plurality ofpassages for the flow of fluid to be metered, andwith automaticobstructing means comprising a disk covering said passages when therotor is at rest and arranged to move axially away from said rotorundeithe Vinfluence of fluidflowing through the rotor, said diskprovided with one or more orifices communicating with one or more ofsaid passages of the rotor, and directed rearwardly with reference tothe direction of' normal rotation of the rotor, whereby i'eaction of thefluid escaping from such orifice or orifices tends to start the rotor inrotation.

' 16. A fluid meter comprising a rotor provided with a plurality of'passages for the flow of fluid to be metered, and with automaticobstructing means comprising a disk I covering said passages when therotor is Vat rest and arranged to move axially away from said rotorunder the influence of fluid flowing through the rotor, said diskprovided lwith one or more slots extending from theperiphery of'saidAdisk inward and forming orifices for the flow of' fluid from one ormore of the passages of said rotor, said slots directed rearwardly withreference to the `normal direction of rotation of the rotor,

and a ring fitting over the periphery of said disk. i

17. A fluid meter comprising a rotorprovided with a plurality ofpassages foi-.the

flowv of' fluid to be metered, and with `auto-4 matic obstructing meanscomprising an obsti'uctor disk mounted upon the liub of the rotor andarranged to move axially thereon `away from the rotor, said rotor anddisk provided with means for preventing rotation of said disk withreference to said rotor.

1S. A fluid meter comprising in combina-V tion arotor chamber, providedwith a spindle having a thrust-bearing shoulder, a rotor' andabraketherefor freely mounted on said spindle, both. adaptedfto rotateandmove Y axially thereon, said brake being adapted atlarge flow tofengagesaid shoulder to limit the axial mot-ion of the brake.

19; A fluid meter comprising in combina-` *tion'a pressure casing, andal rotor and a brake plate vtherefor within said casing, said rotor andsaid brake plate'being adaptedto Vrotate and also to move'axially inl"saidca'sing, one of said members being provided? ywith means foradmittinglfli'iid under pressure between said rotor and saidbrake plate.

20. A fluid meter-comprising in combination a rotor chamber, providedwith'inlet and outlet passages, a rotor `within said"` chamber andmounted to rotate andalso to Vmove axially, said rotor providedi with akbeveledged valve arranged to 4eiigageacorresponding seat adjacent theconnection of' said linlet passage to said rotor chamber, tor i shutofip admission of'iuid to the rotor chamber, said valve arranged Itomove from its seatand thereby move the rotor axially,

against an opposing force, Vupon the commencement of material flow.

21. A fluid meter comprising in combination, a pressure casing, a mainrotor therein, and a secondary rotor and mechanism arranged to be drivenboth by the main rotor and by said secondary rotor, said secondary rotorarranged to drive such mechanism at rates of flo-w too low forvcorre'ctdrive of said mechanism vby thev main rotor.

22. A fluid meter comprising in combination a pressure casing, amainrotor therein,

and a secondary rotor and mechanism arranged to be driven both by themain rotor and by said secondary rotor, said secondary rotor providedwith one-or more nozzle orifices arranged to proyect the Huid metered`in a direction to cause rotation of the secondary rotor Vin thedirection ofnormalrotation of the main rotor.

23. A fluid meter comprising in combination a pressure casing, a mainrotor therein having flow passages, a secondary rotor, and

Vmechanism arranged to be driven by said main rotor and secondary rotor,said secondary rotor having one or more vnozzle orifices arranged toproject the` fluid metered in a direction to ycause rotation ofthesecondary rotor inthe directionof normal rotation of the :main rotor,said secondary rotor arranged toclose the flow passages of the ymainrotor at low flows exceptfor the escape permitted by said nozzleorifices, and arranged to open the flow passages of the main rotor atlarger flows.

24. A fluid meter comprising in combination a pressure casing, a rotortherein'and af Speeder for said rotor, both having ports slanting inthelsame direction. i 4' 25. A fluid meter comprising'in combination apressure casing, la. rotor thereinand a Speeder for saidvrotor, bothhaving "ports' greater than. those in the Speeder.

26. A fluid meter comprising in combination a mam casing, a rotortherein and a speeder for said rotor, both said rotor and said speederbeing mounted on common axis and adapted to rotate at the same speed andto move axially a variable amount.

27. A fluid meter Comprising in combina.- tion a main casing, a rotortherein and a speeder for said rotor, both the rotor and the Speederbeing adapted to rotate and move axially, the axial movement of theSpeeder being greater than that of the rotor.

28. A i'iuid meter comprising in combination a main casing, and tworotors in said easing, one of said rotors being adapted to actuate aregistering mechanism at large flows, and the other rotor to aetuate itat small Hows.

Q9. A Huid meter comprising in Combination a pressure casing, a rotortherein and a speeder t erefor, said rotor being adapted to drive thespeeder at large flows and to be driven by the Speeder at low flows.

30. A fluid meter comprising in combina tion a pressure easing, tworotors therein,

one of said rotors being adapted to drive the other rotor at largelflows and to be driven by it at small Hows.

81. A fluid meter Comprising in combination a pressure easing, a rotortherein and a speeder, both arranged to rotate and have an axial motionof variable extent, said rotor being adapted to be held in suspensionwhile the fluid is in motion and to come to a sudden stop when the flowceases.

32. A Huid meter Comprising in combination a main casing, rotor thereinmounted for rotation and having a plurality of slanting passages for theluid, a Speeder for said rotor having also one or more slanting passagesfor the fluid, the said passages for the flow in the rotor and theSpeeder slanting in. the same direction, but being of different area.

n testimony whereof have signed this specification in the presence oftwo subscribing witnesses.

FRANK LAMBERT..

`Witnesses H. M. MARBLE, D. A. Davies.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner ot Patente, Washington, D. C.

